1994 Pontiac Grand Am GT. Where is rainwater leak from on driver side floor of my car?

SOURCE: 2000 grand prix leaking on drivers side floor board

I have a 99 Grand Prix that had the same problem. There is a rubber gasket that has probably come loose that is under the plastic air inlet grille. This grille is up against the windshield and the wiper go through mine in my 1999. Remove this grille and you should see a water deflector that has come loose. Use some silcone to secure it back in place and that should stop the water problem.

SOURCE: Rainwater Leak (2001 Stratus SE)

Check at the bottom of the door there is a hole(****) out side the seal that is suppose to let the water out when it rains, it is probably clogged with leaves or debris. It is hard to see. i had the same problem.

SOURCE: Pontiac Grand Prix Drivers side window won't go down

Most often on those the motors are shot. as soon as they are activated they overheat and slow down or stop. Only way I know of to repair is to replace them. You will need a manual to do this or do them one at a time so you can check how it goes back together by looking at other one. Motors are riveted in and need to be drilled to remove...use small bolts to re-attach.
I've seen motors online for about $30-40 each.

SOURCE: driver side mirror 2004 Pontiac Grand Am

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can access the bolts that secure the mirror onto the door

SOURCE: I have water leaking into the car on the passenger

sounds like your heater core is leaking